How are outages modeled in vSPD?

Looking through vSPD, I'm wondering how outages are defined in the model. The data in the GDX file seems to define parameters for different branches, but how can I go from looking at POCP outages and figure out which ones are reflected in the model? Are the constraints provided by the system operator, and then implemented in the GDX? Is there a base grid that is used and subtracted from, similar to the FTR auctions?

To model an outage on ARA_T2.T2 for all periods: i_TradePeriodBrachOpenStatus(tp,'ARA_T2.T2') = 1;

To model an outage on ARA_T2.T2 for periods 15: i_TradePeriodBrachOpenStatus('TP15','ARA_T2.T2') = 1;

Note that if a branch is currently modelled as out of service in the GDX file, setting set i_TradePeriodBrachOpenStatus to 0 does not guarantee this branch is reconnected. You can easily model a branch outage in vSPD but to reconnect a line already out is a little more complicated.